【摘要】 利用电解纯铁,通过高温钼丝炉制备了含有不同种类、不同含量异质核心的试样.利用差热分析方法测定了试样在相同冷却速度条件下的过冷度.从理论上比较了铁液凝固热力学驱动力的不同计算方法及误差,计算了铁液在凝固过程中的热力学驱动力,形核功和临界晶核半径.更多还原

【Abstract】 By using of electrolytic pure iron, the specimen containing different heterogeneous nucleus and contents were made in an Mo wire furnace. The DTA method was employed to measure the undercooling of liquid iron during solidification. Equations to calculate the change of Gibbs free energy of solid and liquid iron in solidification were reviewed theoretically. Calculations were performed to obtain Gibbs free energy difference between solid and liquid, critical radius of nucleus and the activation energy in solidification.更多还原